Franklin stove



D. STUART.

A Stove.

No. 22,518 Patented Jany 4, 1859.

hara/555.55,

' heat to a great extent.

UNITED STATES PATENT OFFICE.

DAVID STUART, OF PHILADELPHIA, PENNSYLVANIA.

FRANKLIN STOVE.

Specification of Letters Patent No. 22,518, dated January 4:, 1859.

To all whom it may concern:

Be it known that I, DAVID STUART, of Philadelphia, in the county ofPhiladelphia and State of Pennsylvania, have invented an Improvement inFranklin Stoves, and that the following is a full, clear, and exactdescription of the principle or character which distinguishes it fromall other things before known and of t-he usual manner of making,modifying, and using the same, reference being had to the accompanyingdrawings, of which- Figure l is a vertical middle section from back tofront of the stove showing the air chamber A entire. Fig. 2 is a plan ofthe front and main portion of chamber A and Fig. 3 is a plan of the backportion of said chamber.

Hy invention consists in an improvement in Franklin stoves described andrepresented as follows:

In the construction of Franklin stoves in the usual way the plateforming the lire back is generally warped, cracked or destroyed longbefore other plates of the stove are injured by the heat of the fire.There is also a great amount of heat lost in consequence of the nonconducting space between the lire back and the back plate of the stove.These two defects I have remedied by the introduction of the air heatingchamber A in such manner that while it forms the fire back, it preservesthe same from excessive heat and utilizes what was before waste Thischamber is formed by casting, in two parts C and D; the part C formingthe main port-ion of the walls of the chamber and the part D forming theback plate or wall of the chamber and fitting closely withinthe raisededges or flanges around C. On plate C are cast projecting ledges B theofce of which is to cause the air which passes through the chamber to bedistributed throughout the same these ledges extending from plate C toplate D. On the upper part of the chamber is a pipe E which passesthrough the top plate of the stove, and near the lower part of thechamber is a pipe F which admits the cool air of the room into thechamber. When the stove is put up the air chamber is let down andsupported upon the ledges K, the pipe F passing out through an aperturein the back plate of the stove and the pipe E passing through the topplate. The escape pipe P is so situated that the draft passes over aportion of the back of the chamber A and thereby contributes to equalizethe distribution of heat and at the same time increase the heatingcapacity of the chamber. The constant current of air over the plateforming the fire back prevents its warping, cracking or burning out, andthe heat absorbed therefrom and imparted to the air from this and theback wall of the chamber is all utilized.I

I do not claim forming an air space or chamber in which air circulatesbehind or in contact with the fire backs of stoves and passes thence ina heated condition into the apartment as that has long been known andused, but

W'hat I do claim as my improvement in Franklin stoves is- Forming thefire back of such Stoves by the front wall of a cell or chamber aroundor on both sides of which the draft passes and through which the aircirculates as set forth said cell or chamber being constructed andconnected with the stove in the manner set forth.

DAVID STUART.

lVitnesses P. MAGEE, A. I-I. PERKINPINE.

